2 * (C) Copyright 2012 SAMSUNG Electronics
3 * Jaehoon Chung <jh80.chung@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/dwmmc.h>
14 #include <asm/arch/clk.h>
15 #include <asm/arch/pinmux.h>
16 #include <asm/arch/power.h>
18 #include <asm-generic/errno.h>
20 #define DWMMC_MAX_CH_NUM 4
21 #define DWMMC_MAX_FREQ 52000000
22 #define DWMMC_MIN_FREQ 400000
23 #define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001
24 #define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001
26 /* Exynos implmentation specific drver private data */
27 struct dwmci_exynos_priv_data {
32 * Function used as callback function to initialise the
33 * CLKSEL register for every mmc channel.
35 static void exynos_dwmci_clksel(struct dwmci_host *host)
37 struct dwmci_exynos_priv_data *priv = host->priv;
39 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
42 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
48 * Since SDCLKIN is divided inside controller by the DIVRATIO
49 * value set in the CLKSEL register, we need to use the same output
50 * clock value to calculate the CLKDIV value.
51 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
53 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
54 & DWMCI_DIVRATIO_MASK) + 1;
55 sclk = get_mmc_clk(host->dev_index);
58 * Assume to know divider value.
59 * When clock unit is broken, need to set "host->div"
61 return sclk / clk_div / (host->div + 1);
64 static void exynos_dwmci_board_init(struct dwmci_host *host)
66 struct dwmci_exynos_priv_data *priv = host->priv;
68 if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
69 dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
70 dwmci_writel(host, EMMCP_SEND0, 0);
71 dwmci_writel(host, EMMCP_CTRL0,
72 MPSCTRL_SECURE_READ_BIT |
73 MPSCTRL_SECURE_WRITE_BIT |
74 MPSCTRL_NON_SECURE_READ_BIT |
75 MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
78 /* Set to timing value at initial time */
80 exynos_dwmci_clksel(host);
83 static int exynos_dwmci_core_init(struct dwmci_host *host, int index)
86 unsigned long freq, sclk;
87 struct dwmci_exynos_priv_data *priv = host->priv;
92 freq = DWMMC_MAX_FREQ;
94 /* request mmc clock vlaue of 52MHz. */
95 sclk = get_mmc_clk(index);
96 div = DIV_ROUND_UP(sclk, freq);
97 /* set the clock divisor for mmc */
98 set_mmc_clk(index, div);
100 host->name = "EXYNOS DWMMC";
101 #ifdef CONFIG_EXYNOS5420
102 host->quirks = DWMCI_QUIRK_DISABLE_SMU;
104 host->board_init = exynos_dwmci_board_init;
106 if (!priv->sdr_timing) {
108 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
110 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
113 host->caps = MMC_MODE_DDR_52MHz;
114 host->clksel = exynos_dwmci_clksel;
115 host->dev_index = index;
116 host->get_mmc_clk = exynos_dwmci_get_clk;
117 /* Add the mmc channel to be registered with mmc core */
118 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
119 printf("DWMMC%d registration failed\n", index);
125 static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM];
127 static int do_dwmci_init(struct dwmci_host *host)
129 int index, flag, err;
131 index = host->dev_index;
133 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
134 err = exynos_pinmux_config(host->dev_id, flag);
136 printf("DWMMC%d not configure\n", index);
140 return exynos_dwmci_core_init(host, index);
143 static int exynos_dwmci_get_config(const void *blob, int node,
144 struct dwmci_host *host)
148 struct dwmci_exynos_priv_data *priv;
150 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
152 error("dwmci_exynos_priv_data malloc fail!\n");
156 /* Extract device id for each mmc channel */
157 host->dev_id = pinmux_decode_periph_id(blob, node);
159 host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
160 if (host->dev_index == host->dev_id)
161 host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;
163 if (host->dev_index > 4) {
164 printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
168 /* Get the bus width from the device node */
169 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
170 if (host->buswidth <= 0) {
171 printf("DWMMC%d: Can't get bus-width\n", host->dev_index);
175 /* Set the base address from the device node */
176 base = fdtdec_get_addr(blob, node, "reg");
178 printf("DWMMC%d: Can't get base address\n", host->dev_index);
181 host->ioaddr = (void *)base;
183 /* Extract the timing info from the node */
184 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
186 printf("DWMMC%d: Can't get sdr-timings for devider\n",
191 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
192 DWMCI_SET_DRV_CLK(timing[1]) |
193 DWMCI_SET_DIV_RATIO(timing[2]));
195 /* sdr_timing didn't assigned anything, use the default value */
196 if (!priv->sdr_timing) {
197 if (host->dev_index == 0)
198 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
199 else if (host->dev_index == 2)
200 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
203 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
204 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
205 host->div = fdtdec_get_int(blob, node, "div", 0);
212 static int exynos_dwmci_process_node(const void *blob,
213 int node_list[], int count)
215 struct dwmci_host *host;
218 for (i = 0; i < count; i++) {
222 host = &dwmci_host[i];
223 err = exynos_dwmci_get_config(blob, node, host);
225 printf("%s: failed to decode dev %d\n", __func__, i);
234 int exynos_dwmmc_init(const void *blob)
237 int node_list[DWMMC_MAX_CH_NUM];
241 compat_id = COMPAT_SAMSUNG_EXYNOS_DWMMC;
243 count = fdtdec_find_aliases_for_id(blob, "mmc",
244 compat_id, node_list, DWMMC_MAX_CH_NUM);
246 /* For DWMMC always set boot device as mmc 0 */
247 if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) {
248 boot_dev_node = node_list[2];
249 node_list[2] = node_list[0];
250 node_list[0] = boot_dev_node;
253 err = exynos_dwmci_process_node(blob, node_list, count);